/*
 * Copyright (c) 2010, VeRSI Consortium
 *   (Victorian eResearch Strategic Initiative, Australia)
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the VeRSI, the VeRSI Consortium members, nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package versi.vitro.oaiserviceprovider.service.transformer.impl;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.log4j.Logger;

import versi.vitro.oaiserviceprovider.service.transformer.api.StreamFactory;

/**
 * Service implementing {@link StreamFactory}.
 */
public class StreamFactoryImpl implements StreamFactory {
    
    /** log4j instance. */
    static final Logger LOGGER = Logger.getLogger(StreamFactoryImpl.class);

    private ByteArrayOutputStream outputStream = null;
    private ByteArrayInputStream origXMLIn = null;
    private ByteArrayInputStream origXSLTIn = null;

    private byte[] source;
    private byte[] xslt;

    /**
     * Default Constructor.
     * 
     * @param source
     * @param xslt
     * 
     */
    public StreamFactoryImpl(byte[] source, byte[] xslt) {
	super();
	this.source = source;
	this.xslt = xslt;
    }

    /** {@inheritDoc} */
    public Source createXmlInputSource() {
	origXMLIn = new ByteArrayInputStream(source);
	Source xmlInput = new StreamSource(origXMLIn);
	return xmlInput;
    }

    /** {@inheritDoc} */
    public Source createXsltInputSource() {
	origXSLTIn = new ByteArrayInputStream(xslt);
	Source xsltInput = new StreamSource(origXSLTIn);
	return xsltInput;
    }

    /** {@inheritDoc} */
    public Result createXmlOutputResult() {
	outputStream = new ByteArrayOutputStream();
	Result xmlOutput = new StreamResult(outputStream);
	return xmlOutput;
    }

    /** {@inheritDoc} */
    public void close() {
	try {
	    if (outputStream != null) {
		outputStream.close();
	    }
	} catch (IOException ioException) {
	    String message = "Cannot close output xml file after writing transform result ";
	    LOGGER.error(message, ioException);
	    throw new RuntimeException(message, ioException);
	}
	
	try {
	    if (origXMLIn != null) {
		origXMLIn.close();
	    }
	} catch (IOException ioException) {
	    String message = "Cannot close input xml file after reading input. ";
	    LOGGER.error(message, ioException);
	    throw new RuntimeException(message, ioException);
	}
	
	try {
	    if (origXSLTIn != null) {
		origXSLTIn.close();
	    }
	} catch (IOException ioException) {
	    String message = "Cannot close XSLT style sheet file reading stylesheet. ";
	    LOGGER.error(message, ioException);
	    throw new RuntimeException(message, ioException);
	}
    }

    /** {@inheritDoc} */
    public byte[] xmlResult() {
	return outputStream.toByteArray();
    }
}